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Defined Benefit Pension Plan - Additional Information (Details) - GBP (£) | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Defined benefit pension plan |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Operating | Interest Income (Expense), Operating
Maximum |  |
Defined benefit pension plan |  |
Expected contributions | £ 10,000,000 | £ 10,000,000

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